Before you can start fetching the values, you need to get your string syntax right.

What's the point of randomly splitting the string into smaller parts and concatenating them? Remove that. You cannot do "complex" operations like $i + 1 within a string. You need to use concatenation instead.

You also seem to have issues structuring your values. Numbered variables/identifiers like "tmry_option_1", "tmry_option_2", ..., "tmry_option_5135" or "group_1", "group_2", ... are almost always a bad sign. Use arrays instead of a bunch of loose variables.

However, I'm not really sure if you need all that. If you only got a group of radio buttons, why not give it a constant name? Or do you have multiple groups?

Why canít I use certain words like "drop" as part of my Security Question answers?
There are certain words used by hackers to try to gain access to systems and manipulate data; therefore, the following words are restricted: "select," "delete," "update," "insert," "drop" and "null".

Howdy. I am not sure what you are attempting to accomplish as far as radio button names, but if these 5 options are to 1 thing, then all names must match. This may be something more to your goal. I did move all your 'tmry_option' items to an inner array. If this is submitted via POST, then it would be referenced via $_POST['radioChoice']